Coated substrates that include an undercoating
a technology of coating substrates and coating layers, applied in the field of coating substrates, can solve the problems of poor durability, undesirable aesthetic properties, and failure of coating substrates to achieve desired performance, and achieve the effects of increasing durability, reducing reflection, and increasing photocatalytic activity
Active Publication Date: 2008-10-07
VITRO FLAT GLASS LLC
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AI Technical Summary
Benefits of technology
The coated substrate exhibits improved durability, photocatalytic activity, and reduced reflectance, achieving desired performance and aesthetic enhancements by optimizing the refractive index and composition of the undercoating and functional coating layers.
Problems solved by technology
When the functional coating is deposited directly on the substrate, the coated substrate can fail to achieve the desired performance, have poor durability and exhibit undesirable aesthetic properties.
For example, a functional coating applied directly on a substrate may fail to exhibit a desired performance such as a specified amount of photocatalytic activity or exhibit poor durability by peeling off or changing color.
As another example, a functional coating deposited directly on a substrate may exhibit undesirable aesthetic properties such as increased reflectance and / or unwanted color.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0053]The following non-limiting examples are included to illustrate the present invention. All of the data in the example section was modeled using TFCalc software.
[0054]The performance of the following coated substrate was modeled: an undercoating comprising a layer of silica over a layer of tin oxide is on a glass substrate. A functional coating layer comprising a layer of titania is over the aesthetic enhancing coating.
[0055]It is known in the art that visible reflectance values (Y) on the coated side of the coated substrate go up and down as the thickness of the coating layers increases. This stems from the fact that the reflectance of light from thin layers of coatings on glass follows the classic behavior of maxima and minima due to constructive and destructive interference of light waves. The reflectance of the light from thin coatings on glass can be calculated using the Fresnel formula as found in the American Institute of Physics Handbook, 3rd ed., edited by D E Gray (McG...
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Abstract
A coated substrate is disclosed. The coated substrate includes a substrate; an undercoating having one or more materials selected from tin oxide, silica, titania, alumina, zirconia, zinc oxide and alloys and mixtures thereof nitrides of titanium, zirconium, hafnium, silicon, aluminum and mixtures thereof, and oxy-nitrides of titanium, zirconium, hafnium, silicon, aluminum and mixtures thereof overlaying at least a portion of the substrate; and a functional coating overlaying at least a portion of the undercoating. As a result of the undercoating, the coated substrate can exhibit improved properties such as improved aesthetic properties, increased durability, photocatalytic activity, mechanical durability, etc.
Description
[0001]The present invention relates to novel coating compositions, especially coating compositions that can be used as an undercoating for a functional coating.BACKGROUND[0002]Substrates such as glass and steel are used to make buildings, appliances, cars, etc. Oftentimes, it is necessary to apply a functional coating(s) over the substrate to achieve certain performance properties. Examples of functional coatings are electroconductive coatings, photocatalytic coatings, low emissivity coatings, hydrophilic coatings, hydrophobic coatings, anti-reflective coatings, etc.[0003]Typically, the functional coating is deposited directly on the substrate. When the functional coating is deposited directly on the substrate, the coated substrate can fail to achieve the desired performance, have poor durability and exhibit undesirable aesthetic properties. For example, a functional coating applied directly on a substrate may fail to exhibit a desired performance such as a specified amount of photo...
Claims
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IPC IPC(8): B32B9/00
CPCC03C17/3417C03C17/3435
Inventor KUTILEK, LUKE A.HARRIS, CAROLINEATHEY, PATRICIA R.LU, SONGWEI
Owner VITRO FLAT GLASS LLC